This is a true story! Last summer, down on Lake Isabella, located in the high desert, an hour east of Bakersfield, California, some  folks, new to boating, were having a problem. No matter how hard they tried, they  couldn't get their brand new 22-ft Bayliner to perform. It wouldn't get on a plane at all, and it was very sluggish in almost every maneuver, no matter  how much power was applied. 

After about an hour of trying to make it go, they putted over to a nearby marina, thinking someone there could tell them what was wrong. A thorough topside check revealed everything in perfect working order. The engine ran fine, the outdrive went up and down, the prop was the correct size and pitch. So, one of the marina guys jumped in the water to check underneath. He came up choking on water, he was laughing so hard. 
 

(REMEMBER, THIS IS TRUE.....) Under  boat, 
still strapped securely in place, was the trailer.